Thermodynamics of Complexation of 18-Crown-6 with NH4+ Ion in Water-Dioxane Mixtures
作者： IS Zaitseva , NN Belash , NV Bondarev , None
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摘要: The stability constants of 1 : complexes ammonium ion with 18-crown-6 in water and aqueous dioxane (dioxane weight fraction 0.2, 0.4, 0.6, 0.8) the range 283-318 K were determined electrometrically, thermodynamic parameters complexation calculated. is by enthalpy factor. contributions from Gibbs energy solvation NH4 + ion, 18-crown-6·NH4 + complex, free to stabilization complex increasing content mixed solvent estimated. thermodynamics ammonium, sodium, potassium ions aqueous-organic solvents, such as water-2-propanol, water-acetone, water-dioxane, compared considering effects reactant solvation. variations conformational component selective reactants evaluated. influence dielectric permittivity donor-acceptor properties solvents on cations was subjected correlation analysis.
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